A semi-grouting sleeve for fabricated structure steel bar connection

Abstract

Invention Title: A Semi-Grouting Sleeve for Reinforcing Steel Connection in Prefabricated Structures Abstract: This invention discloses a semi-grouting sleeve for connecting reinforcing steel in prefabricated structures, comprising reinforcing steel to be connected, an eccentric connector, and a grouting sleeve. The upper end of the reinforcing steel to be connected has threads. The eccentric connector has threaded holes and threads at both ends. The threaded hole near the upper reinforcing steel end is eccentric, while the thread near the grouting sleeve is aligned with the center of the connector and has the opposite direction to the threaded end of the upper reinforcing steel. The grouting sleeve has a threaded hole at its upper center and a grout inlet at its lowermost end. This invention overcomes the limitation of using grouting sleeves in cases of significant eccentricity during actual construction by installing an eccentric connector. Furthermore, the opposite directions of the reinforcing steel threads and the eccentric connector threads create a self-locking effect. During grouting, the threaded hole at the upper part of the grouting sleeve can also serve as a grout outlet and observation hole. The invention is simple to manufacture and improves the overall connection quality.

Description

Technical Field

[0001] This invention relates to the field of new building structure technology, and more specifically to a semi-grouted sleeve for connecting steel bars in prefabricated structures. Background Technology

[0002] Reinforcing bar connections are methods of connecting reinforcing bars. Currently, the main connection methods for reinforcing bars are divided into four categories: lapped connections, mechanical connections, grouted sleeve connections, and welded connections. Reinforcing bar connections should be placed in areas of low stress in the building structure to avoid damage to the connecting parts.

[0003] The existing technology has the following problems:

[0004] Existing grouting sleeve connectors are not suitable for situations with significant eccentricity during actual construction, requiring the selection of other steel reinforcement connection methods, which affects the efficiency of prefabricated structure connection construction. Existing grouting sleeve connectors generally require the setting of grout inlet and outlet ports, and the manufacturing process and sleeve structure are relatively complex, making it difficult to judge the grouting density and easily causing safety hazards. Summary of the Invention

[0005] The purpose of this invention is to provide a semi-grouting sleeve for connecting steel bars in prefabricated structures. By utilizing an eccentric connector, it overcomes the situation where grouting sleeves cannot be used when there is a large eccentricity in actual construction. At the same time, the threads of the steel bars and the threads of the eccentric connector are opposite in direction, which produces a self-locking effect. By utilizing the screw hole on the upper part of the grouting sleeve, the screw hole can also serve as a grout outlet and an observation hole during the grouting process. It is simple to manufacture and improves the overall connection quality.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A semi-grouted sleeve for connecting steel bars in prefabricated structures, characterized in that: it includes an upper steel bar to be connected 1, an upper steel bar end thread 11, a lower steel bar to be connected 2, an eccentric connector 3, an eccentric screw hole 31 inside the eccentric connector, an external center thread 32 of the eccentric connector, a grouting sleeve 4, and a grouting sleeve inlet 41.

[0008] The upper end of the reinforcing bar to be connected has a positive thread, and the outer center thread 32 of the eccentric connector 3 has a negative thread.

[0009] Preferably, the inside of the grouting sleeve is serrated.

[0010] Preferably, the diameter of the upper screw hole of the grouting sleeve is the same as the minimum internal diameter of the grouting sleeve.

[0011] Preferably, the thread direction of the eccentric connector is opposite to the thread direction of the end of the upper reinforcing bar to be connected.

[0012] Preferably, the outer diameter of the eccentric connector is the same as the outer diameter of the grouting sleeve. Preferably, grouting material is injected on-site into the grouting sleeve and the lower reinforcing bar to be connected.

[0013] In the above technical solution, the semi-grouted sleeve for steel bar connection in prefabricated structures provided by the present invention has the following beneficial effects:

[0014] 1. This invention utilizes an eccentric connector to overcome the situation where grouting sleeves cannot be used in actual construction when there is a large eccentricity. At the same time, the threads of the reinforcing bar and the threads of the eccentric connector are opposite in direction, which produces a self-locking effect.

[0015] 2. This invention utilizes the screw hole on the upper part of the grouting sleeve. During the grouting process, the screw hole can also serve as a grout outlet and an observation hole, which is simple to manufacture and improves the overall connection quality. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the structure of the semi-grouting sleeve provided in an embodiment of the present invention;

[0017] In the figure: 1-Upper reinforcing bar to be connected, 11-Threaded end of upper reinforcing bar, 2-Lower reinforcing bar to be connected, 3-Eccentric connector, 31-Eccentric threaded hole inside eccentric connector, 32-Central thread outside eccentric connector, 4-Grouting sleeve, 41-Grouting inlet of grouting sleeve. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] This invention discloses a semi-grouted sleeve for connecting steel bars in prefabricated structures. It is characterized by comprising the steel bars to be connected, an eccentric connector, and a grouting sleeve. The upper steel bar to be connected has a threaded end. The eccentric connector has a threaded hole and a threaded connection at both ends. The threaded hole near the upper steel bar end is eccentric, and the thread near the grouting sleeve is aligned with the center of the connector and runs in the opposite direction to the threaded connection at the upper steel bar end. The grouting sleeve has a threaded hole at the center of its upper end, and a grout inlet at its lowest point.

[0020] Furthermore, the inside of the grouting sleeve is serrated.

[0021] Furthermore, the diameter of the upper screw hole of the grouting sleeve is consistent with the minimum internal diameter of the grouting sleeve. Furthermore, the thread direction of the eccentric connector is opposite to the thread direction of the upper end of the reinforcing bar to be connected.

[0022] Furthermore, the outer diameter of the eccentric connector is consistent with the outer diameter of the grouting sleeve.

[0023] Furthermore, grouting material is injected on-site into the grouting sleeve and the lower reinforcing steel bars to be connected. Referring to Figure 1, the method of using this invention includes the following steps:

[0024] Step 1: The prefabricated components with multiple lower reinforcing bars 2 to be connected and the prefabricated components with multiple upper reinforcing bars 1 to be connected are prefabricated in the factory and then transported and hoisted to the site.

[0025] Step 2: Align the prefabricated components with multiple lower reinforcing bars 2 and multiple upper reinforcing bars 1 to be connected at each vertical point, in preparation for installing the reinforcing bar connectors;

[0026] Step 3: Insert the lower reinforcing bar 2 to be connected into the grouting sleeve through the lower end of the grouting sleeve;

[0027] Step 4: Inject grout through the grout inlet 41 at the lower end of the grouting sleeve 4. During the process, observe the grouting process through the upper screw hole. Excess grout is discharged through the upper screw hole. After grouting is completed, check the grouting density through the upper screw hole.

[0028] Step 5: Rotate the threaded end of the upper reinforcing bar 1 to be connected to the eccentric threaded hole 31 inside the eccentric connector 3;

[0029] Step 6: Clean the grout material from the screw hole, and rotate the grouting sleeve and the eccentric connector 3 in the opposite direction to connect them;

[0030] Step 7: Pour concrete in the rebar connection area to complete the connection.

[0031] Step 8: Repeat steps 1 to 7 above to complete the overall prefabricated structure connection.

[0032] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A semi-grouted sleeve for connecting reinforcing bars in prefabricated structures, characterized in that, It comprises a reinforcing bar to be connected, an eccentric connector, and a grouting sleeve. The upper reinforcing bar to be connected has a threaded end. The eccentric connector has a threaded hole and a threaded end at both ends. The threaded hole near the upper reinforcing bar end is eccentric, and the thread near the grouting sleeve is aligned with the center of the connector and is opposite in direction to the threaded end of the upper reinforcing bar. The grouting sleeve has a threaded hole at the center of its upper end, and the lowest end is the grout inlet. The threaded direction of the eccentric connector is opposite to the threaded direction of the upper reinforcing bar end. The grouting sleeve has a serrated interior; the diameter of the upper screw hole of the grouting sleeve is the same as the minimum diameter inside the grouting sleeve; the outer diameter of the eccentric connector is the same as the outer diameter of the grouting sleeve.

2. A semi-grouted sleeve for rebar connection in prefabricated structures according to claim 1, characterized in that, Grouting material is poured into the grouting sleeve and the lower reinforcing bars to be connected on site.

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